ISIS Neutron and Muon Source Data Journal
This is a page describing data taken during an experiment at the ISIS Neutron and Muon Source. Information about the ISIS Neutron and Muon Source can be found at https://www.isis.stfc.ac.uk.
Phonon confinement gap in Ln-based nanocrystals
Abstract: The phonon density of states (PDOS), which plays an important role in the mechanisms that determine the unique physical properties of nanocrystals (NCs), strongly depends on the reduced size of the NC. While these confinement effects are often invoked to explain surprising results, the direct study of lattice dynamics in NCs is difficult. Theoretically, it is shown that as the NC size decreases, the gapless and continuous PDOS observed in the bulk becomes discrete and is characterized by a cutoff in the low-frequency part of the spectrum ? the so called phonon confinement gap. Here we propose to measure the PDOS of both nanocrystalline and bulklike microcrystalline samples of photon-upconverting NaYb0.98Er0.02F4 with high resolution cold TOF neutron spectrometer LET. The data obtained will allow us to investigate the size effects on PDOS and extract the phonon confinement energy gap.
Public release date: 17 November 2025
Principal Investigator: Dr Frank Weber
Experimenter: Dr Yuliia Tymoshenko
Local Contact: Dr David Voneshen
DOI: 10.5286/ISIS.E.RB2220287-1
Parent DOI: 10.5286/ISIS.E.RB2220287
ISIS Experiment Number: RB2220287
Part Number: 1
Date of Experiment: 15 November 2022
Publisher: STFC ISIS Neutron and Muon Source
Data format: RAW/Nexus
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Data Citation
The recommended format for citing this dataset in a research
publication is as:
[author], [date], [title], [publisher],
[doi]
For Example:
Dr Frank Weber et al; (2022): Phonon confinement gap in Ln-based nanocrystals, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2220287-1
Data is released under the CC-BY-4.0 license.
